Neural Speech Tracking during Selective Attention: A Spatially Realistic Audiovisual Study

Area of Science:

• Neuroscience
• Auditory Perception
• Cognitive Psychology

Background:

• Selective attention to speech is crucial in multitalker environments.
• Neural tracking of speech is a common measure, often showing a bias towards target speech.
• Previous studies used controlled acoustic environments, limiting real-world applicability.

Purpose of the Study:

• To investigate neural bias towards target speech in a spatially realistic audiovisual setting.
• To examine how switching target talker identity affects neural bias.
• To assess the correlation between neural tracking, neural bias, and behavioral performance.

Main Methods:

• Utilized electroencephalography (EEG) to measure neural speech tracking.
• Employed a spatially realistic audiovisual paradigm with concurrent speech.
• Manipulated target talker identity and assessed neural and behavioral responses.

Main Results:

• Group analysis revealed a robust neural bias towards the target talker, persisting after talker identity switches.
• Individual participant data showed significant variability; over 50% exhibited similar neural tracking of both target and non-target speech.
• Neural speech tracking did not consistently correlate with neural bias or behavioral performance.

Conclusions:

• Neural bias towards target speech is observable in ecologically relevant audiovisual settings.
• Neural bias is not a ubiquitous or necessary indicator of selective auditory attention.
• Individual differences in speech prioritization strategies may explain the observed variability in neural responses.